On investigation I discovered with the help of others that Yosemite requires signed drivers, if you rename the kext files or edit the plist file it disables the signing and the driver will no longer install.

I am now waiting for certification from Apple which will take 7 - 10 days assuming that they approve my application. If I get certification I will build a certified driver.

There is one alternative if you need it now, you can run a uncertified driver by disabling the gatekeeper which will then allow uncertified drivers to run. Wolfgang at SMM has confirmed this works. Note: this allows any uncertified program to run with out confirmation.